Has someone ever mistook you being nice to them as you being interested in them?

This is something that happens primarily to women, but it happened to me as well.

In the last month I have been having an auditor following my activities - it's standard procedure in my field. She's young (not even 25), just graduated and this is her first job.

She does her best to be professional and stick to the rules and guidelines, to the point of being overly strict - which I understand - however I noticed she tends to jump to conclusions. For example, I did my best to make her feel welcome, finding a good parking spot for her, also trying to mentor her a bit since she has just started while also respecting her authority as an auditor.

One day I asked her if I could treat her for lunch, and she said "But aren't you married with children?". I was a bit taken aback and said that I am, and if she wanted she could have met them. It was then that she made a very strange face and sputtered a bit, before agreeing to go out. My impression is that she mistook me being nice and giving her all those attentions as either me trying to get good reports from her or me actually being into her. Or both.

Updates
1 y
If you are wondering how is our relationship now - she insisted she wanted to see some paperwork from 1967 to 1987
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1 y
, we spent the whole morning going through dusty papers in an old wet cellar, until she had some kind of coughing fit and we gave up on it.
Has someone ever mistook you being nice to them as you being interested in them?
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